Adjustable Attachment System

ABSTRACT

An embed for embedding in a base is provided. The embed comprises a box defining a top face and at least one side face, the top face configured to be placed flush with an upper surface of the base, and the at least one side face configured to be placed flush with an edge of the base. The embed may be part of an adjustable attachment system comprising an embed for positioning in a base and a bridging clip configured for insertion in the embed and adapted for coupling to a unit. A kit is also described.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation-in-part application of U.S. patent application Ser. No. 11/208,444, filed Aug. 19, 2005. The subject matter of the above applications are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to an adjustable attachment system. More specifically, the present invention relates to an adjustable attachment system wherein a bridging clip adapted for receiving an attached component is placed in an embed and the positioning of the bridging clip may be adjusted in two orthogonal directions.

BACKGROUND OF THE INVENTION

Construction technology often employs unitized curtainwall units that are anchored to the building structure. A curtainwall system is a lightweight exterior cladding which is hung on the building structure, usually from floor to floor. It can provide a variety of exterior appearances. Curtainwalls are designed to accommodate structural deflections, control wind-driven rain and air leakage, minimize the effects of solar radiation, and provide for maintenance-free long term performance.

The curtainwall is an external, lightweight, generally non-loadbearing wall that is hung from a frame rather than built up from the ground; the framework it shields is usually of concrete or steel. Curtainwalls may be used with any suitable structure but are typically used in high-rise blocks. Typically light, the use of curtainwalls reduces the forces on the foundations, making the building lighter. Curtainwalls are a form of prefabricated construction and can be installed with relative ease, even at significant heights above the ground. Curtainwalls are frequently produced in a ready-to-install form, and thus can be installed as discrete building units.

One aspect of both the design and the installation of a curtainwall is its anchorage to the building structure. Generally, the curtainwall units are anchored to concrete floor slabs, columns and/or shear wall of building structures. Many types of anchor and a variety of methods are used.

Prior art attachment mechanisms for anchoring the curtainwall units to the building structure generally comprise manufactured plates, channel struts, and drilled anchor bolts. Strut type embeds are used in attachment to the face of slab, to columns, or to shear walls. The distance from the building frame face (slab, shear wall, or column) to the back of the curtainwall is desired at approximately at least 2.5 times the specified allowable concrete tolerance plus the bridging clips thickness. Embedded strut type embeds typically have limited, preset depth and thus have no capability for in/out adjustment perpendicular to the plane of the frame to absorb tolerance. Thus, strut type embeds have lateral adjustment only in the plane of the slab, column, or shear wall. In order to effect in/out adjustment, complex two-part primary bridging clips plus ancillary parts are used and must be bolted or welded together to form an assembly. The assembly is then bolted to the strut embed. Protrusions such as the protrusion of the assembly from the strut embed may encroach on the in/out tolerance desired with the distance from the building frame. Further, the two-part bridging clips used for strut type embeds generally interfere and or extend into the plane of the backside of the curtainwall units.

FIGS. 1-3 illustrate prior art anchor systems for attaching a curtainwall to a building frame. FIGS. 1 and 2 illustrate a face of slab anchor system 100. FIG. 3 illustrates a top of slab anchor system 102. As shown, the face of slab anchor system 100 comprises an embed anchor 104, an adjustment piece 106, and an attached piece 110. The embed anchor 104 extends a preset amount into the slab 112. In/out adjustability is provided by the adjustment piece 108. The adjustment piece 108 extends from the face of the slab 112 and thus encroaches on the in/out tolerance of the distance of the attached piece 110 to the slab 112. The attached piece 110 is coupled to the adjustment piece 106.

The top of slab anchor system 102 of FIG. 3 illustrates an embed anchor 114, an adjustment and attachment piece 116, and an attached piece 118. The embed anchor 114 is anchored in the top of the slab 112. The adjustment and attachment piece 116 extends towards the face of the slab 112. The amount of extension of the adjustment and attachment piece 116 determines whether the adjustment and attachment piece 116 is flush with the face of the slab 112 or extends beyond the face of the slab 112. The attached piece 118 is coupled to the adjustment and attachment piece 116. This coupling may be achieved directly or indirectly.

In the past, it has been desirable to locate an anchor in an easily accessible location on top of the floor slab because, while a location on the slab edge, or on the outward facing surface of the frame, is feasible, drilling and welding on the slab edge is more difficult and there is less room for adjustment to accommodate building frame variations. Curtainwall units must be anchored and fixed to a precise theoretical location in space irrespective to the frame's finished location. The difference between the two locations is referred to as tolerance. To bridge the difference in these locations, manufactured parts known as adjustable anchor clips (or adjustable secondary bridging clips) are employed. The clips are typically made utilizing slotted holes, shims or field welding to make the connection between the point of attachment on a building structure and a curtainwall unit.

BRIEF SUMMARY OF THE INVENTION

An embed, an adjustable attachment system, an adjustable attachment system kit, and method for attaching a unit to a base is provided.

In one embodiment, an embed for embedding in a base may include a box defining a top face and at least one side face, the top face configured to be placed flush with an upper surface of the base, and the at least one side face configured to be placed flush with an edge of the base. In another embodiment, the top face may include a substantially open top face configured to provide access to the inside of the embed. In another embodiment, the embed may include a lid configured to cover the open top face. In another embodiment, the top face may include a recessed shelf and a perimeter lip and the lid is recessed into the top face. In another embodiment, the lid may be removably attached to the embed. In another embodiment, the lid may be pivotably attached to the embed. In another embodiment, the side face may include a substantially open side face. In another embodiment, the open side face may be configured to receive a bridging clip. In another embodiment, the embed may include at least one anchor extending from the embed. In another embodiment, the at least one anchor may be a threaded rod anchor. In another embodiment, the embed may be adapted for threaded engagement with the at least one anchor, the at least one anchor adjustably extending into the internal volume of the embed.

In another embodiment, an adjustable attachment system includes an embed for positioning in a base and a bridging clip configured for insertion in the embed and adapted for coupling to a unit. In another embodiment, the embed is in the shape of a box. In still another embodiment, the embed is adapted to be positioned flush with the upper and outer surfaces of a base. In still another embodiment, the system further includes at least one anchor extending from the embed. In yet another embodiment, the bridging clip further comprises teeth on an upper surface. In yet another embodiment, the system includes at least one washer with teeth on a bottom surface adapted to engage the teeth of the bridging clip. In still another embodiment, the system includes a peel strip.

In another embodiment, an adjustable attachment system kit includes an embed box with a removably attachable lid, a bridging clip, at least one nut, and at least one washer. In another embodiment, the embed includes at least one threaded rod anchor extending into the internal volume of the embed. In another embodiment, the bridging clip includes slotted holes for receiving the at least one threaded rod anchor. In still another embodiment, the bridging clip includes teeth on an upper surface and the at least one washer includes teeth on a lower surface adapted to engage the teeth of the bridging clip. In yet another embodiment, the at least one nut is adapted for threaded engagement with the anchor.

The adjustable attachment system comprises an embed, a bridging clip and a locking strip. The embed and bridging clip are configured for the bridging clip to be inserted within the embed and the bridging clip and the embed to engage one another. The locking strip is configured for insertion in a space between the bridging clip and the embed to fix the bridging clip in place. The bridging clip may further be adapted for receiving an attachment piece. The embed is anchored to the base and the bridging clip is coupled, directly or indirectly, to the unit to be attached. For attaching a curtainwall unit to a building frame, the embed is anchored in the frame and the bridging clip is coupled to the curtainwall unit.

The method of attaching a unit to a base comprises placing the embed in a base. For example, the embed may be placed in a concrete form and concrete poured into the form. A bridging clip is inserted in the embed, and positioned at a desired position within the embed. A locking strip is inserted in a space between the bridging clip and the embed. The unit is coupled to the bridging clip. Optionally, an attachment piece may be used to couple the unit to the bridging clip.

While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. As will be realized, the invention is capable of modifications in various aspects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a prior art anchor for attaching a curtainwall unit to a building frame.

FIG. 2 illustrates a prior art anchor for attaching a curtainwall unit to a building frame.

FIG. 3 illustrates a prior art anchor for attaching a curtainwall unit to a building frame.

FIG. 4 illustrates an exploded perspective view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 5 illustrates an exploded perspective view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 6 illustrates an exploded perspective view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 7 illustrates a side view of an embed for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 8 illustrates a side view of an embed for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 9 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 10 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 11 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 12 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 13 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 14 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 15 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 16 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 17 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 18 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 19 illustrates a side view of a bridging clip for use with an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 20 illustrates a side view of a locking strip 16 being inserted into an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 21 illustrates a side view of a locking strip 16 being fixed into place in an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 22 illustrates a side view of an assembled adjustable attachment system with a curtainwall hanging therefrom in accordance with one embodiment of the present invention.

FIG. 23 illustrates a side view of an assembled adjustable attachment system with a curtainwall hanging therefrom in accordance with one embodiment of the present invention.

FIG. 24 illustrates a side view of an assembled adjustable attachment system with a curtainwall hanging therefrom in accordance with one embodiment of the present invention.

FIG. 25 illustrates a side view of an assembled adjustable attachment system positioned in a frame with a curtainwall hanging therefrom.

FIG. 26 illustrates a side view of an assembled adjustable attachment system positioned in a frame with a curtainwall hanging therefrom.

FIG. 27 illustrates an exploded perspective view of an adjustable attachment system for attaching a pipe to a base in accordance with one embodiment of the present invention.

FIG. 28 illustrates a front perspective view of an alternative embodiment of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 29 illustrates a rear perspective view of the embodiment of FIG. 28.

FIG. 30 illustrates a side cross-sectional view of the embodiment of FIG. 28.

FIG. 31 illustrates a front view of the embodiment of FIG. 28.

FIG. 32 illustrates an isometric top/front/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 33 illustrates an isometric top/front view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 34 illustrates an isometric top/front/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 35 illustrates an isometric top/rear/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 36 illustrates an isometric bottom/front/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 37 illustrates an isometric top/front view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 38 illustrates an isometric top/front view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 39 illustrates an isometric top/front/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 40 illustrates an isometric top/front/side view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 41 illustrates an isometric top view of an adjustable attachment system in accordance with one embodiment of the present invention.

FIG. 42 illustrates an isometric side view of an adjustable attachment system in accordance with one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

An adjustable attachment system is provided for attaching a unit to a base. While the adjustable attachment system is discussed in reference to attaching a curtainwall unit to a building frame, the adjustable attachment system may be used to attach any unit to any base. For example, the adjustable attachment system may be used to attach a pipe to a base. Further, the attachment system may be used to attach any unit to any surface of a base. For example, the adjustable attachment system may be used to attach a unit to a top surface, bottom surface, or side surface of a base.

The adjustable attachment system permits adjustment in two orthogonal directions, in/out and laterally. Additionally, up/down adjustment may be provided using attachment pieces. The adjustable attachment system comprises an embed, a bridging clip, and a locking strip. The bridging clip may be connected to the embed without the use of bolts and nuts or field welding. The bridging clip thus does not require holes, slots or notches. The adjustable attachment system simplifies locating a curtainwall anchor in the outward facing surface of the frame. Using the adjustable attachment system, the speed of erection and placement of curtainwall units is increased while costs are decreased.

FIGS. 4, 5, and 6 illustrate exploded views of alternate embodiments of an adjustable attachment system 10. As shown, the adjustable attachment system 10 comprises an embed, a bridging clip (or anchor plate) 14, and a locking strip (or wedge block) 16. A peel strip 18, described more fully below, may be provided along a front face of the embed 12.

The embed 12 is positioned in a recess in an outward facing surface of base, as described more fully below. The outward facing surface may be any surface of the base. Thus, for example, the outward facing surface may be a top surface, a bottom surface, or a side surface. The bridging clip 14 is inserted into the embed 12 to a desired in/out position. Teeth 13 are provided along at least one of an upper and lower inner surface of the embed 12. Corresponding teeth 15 are provided along at least one of an upper and lower surface of the bridging clip 14. Once the bridging clip 14 is in the desired in/out position, the teeth 15 on the bridging clip 14 are engaged with the teeth 13 of the embed 12. Thus, teeth 15 provided along an upper surface of the bridging clip 14 engage teeth 13 provided along an upper inner surface of the embed 12. Similarly, teeth 15 provided along a lower surface of the bridging clip 14 engage teeth 13 provided along a lower surface of the embed 12. The position of the bridging clip 14 in the embed 12 may be adjusted laterally. When the desired position is achieved, the locking strip 16 is inserted between the bridging clip 14 and the embed 16 to fix the bridging clip 14 in place. In alternative embodiments, a locking strip may not be used.

Thus, adjustment of the bridging clip 14 is allowed in two orthogonal directions, in/out and laterally. The bridging clip 14 may be connected to the embed 12 without using bolts and nuts or field welding (though bolts, nuts, field welding or other construction techniques may be used if desired).

End closure arms 20 (or anchor plates) may provided with the adjustable attachment system. FIGS. 4, 5, and 6 each illustrate alternate embodiments of the end closure arms 20. The end closure arms 20 operate to seal the interior of the embed 12 from leakage of material along the sides 24 of the embed 12. The end closure arms 20 further provide increased gripping surface along the embed 12. Thus, if the embed 12 is used with a concrete structure and concrete is poured around the embed 12, the concrete has the increased gripping surface of the end closure arms 20 for engagement.

In the embodiments of FIGS. 4 and 5, end seals 22 are provided for positioning between the embed 12 and the end closure arms 20. Thus, after assembled for positioning within the recess, sides 24 of the embed 12 are coupled to the end seals 22 and the end seals 22 are in turn coupled to the end closure arms 20. The embed 12, end seals 22 and end closure arms 20 may be coupled to one another in any suitable manner. For example, fasteners such as screws 26 may be used. Alternately, the embed 12, end seals 22 and end closure arms 20 may be welded together.

The configuration of the end closure arms 20 and the end seals 22 may vary. FIGS. 4, 5, and 6 illustrate various configurations of the end closure arms 20 and the end seals 22 but other configurations, as would be known to one skilled in the art, may be used. In FIGS. 4 and 5, the end closure arms 20 comprise supporting extensions 21 extending laterally over the embed 12. In those embodiments, the profile of the end closure arms 20 thus varies along a portion of the end closure arms 20. In FIG. 4, the end seal 22 correspondingly has a varied profile. In contrast, in FIG. 5, the end seal 22 has a profile that remains substantially unchanged over the entire length thereof. In FIG. 6, no end seal 22 is used and the profile of the end closure arms 20 remains substantially unchanged over the entire length thereof.

In alternate embodiments, only the end seals 22 may be used to seal the sides 24 of the embed 12. Alternately, other means of sealing the sides 24 of the embed 12 may be employed. For example, the embed 12 may be manufactured with closed sides 24.

The embed 12 may be provided with a peel strip 18. The peel strip 18 seals a front portion 26 of the embed 12. The embed 12, may thus be positioned in the recess with the peel strip 18 intact. FIG. 7 illustrates an embed 12 with the peel strip 18 intact. In attaching a curtainwall to a building frame, the embed is positioned in a concrete form and concrete is poured. Once positioned and once surrounding concrete is hardened and/or there is a reduced risk of intrusion of materials through the front portion 26 of the embed 12, the peel strip 18 may be removed. FIG. 8 illustrates an embed 12 with the peel strip 18 removed. The embed 12 and peel strip 18 may be provided in any configuration suitable for removal of the peel strip 18 from the front portion 26 of the embed 12. For example, perforations or grooves may be provided along the border of the peel strip 18 with the embed 12. Provision of a peel strip 18 enables the embed 12 to be extruded as a hollow rather than a semi-hollow. In lieu of a peel strip, a plug may be provided along the front portion 26 of the embed 12. For example, a closed cell foam plug may be used to seal the interior of the embed 12 along the front portion 26 of the embed 12.

As can be seen in FIGS. 4-8, the embed 12 has a front facing portion including lips 17 and 19. The extension of the lips 17 and 19 may vary. Further, the extension of the upper lip 17 may be different from the extension of the lower lip 19. The lips 17, 19 extend along the outward facing surface of the frame. The embed 12 may further be provided with rebar holes 27 for receiving a rebar rod to reinforce the embed 12.

Teeth 13 and 15 are provided along a surface of the bridging clip 14 and a surface of the embed 12. The teeth 13 and 15 engage one another to fix the bridging clip 14 within the embed 12. In alternate embodiments, other means of engaging the bridging clip 14 with the embed 12 may be used. For example, the bridging clip 14 may be fastened to the embed 12 using conventional fasteners, other friction fitting, or any suitable means.

The teeth 13 of the embed 12 and the teeth 15 of the bridging clip 14 may be configured in any engaging configuration so long as the teeth 13 engage with the teeth 15. In one embodiment, as seen most clearly in FIGS. 7 and 8, the teeth 13 of the embed 12 comprise an upwardly extending portion 21 and a slanted surface 23, the slanted surface 23 extending from a base point along the embed 12 to the top point of the upwardly extending portion 21. As shown, the slanted surfaces 23 extend rearwardly away from the front facing portion of the embed 12. The corresponding teeth 15 on the bridging clip 14 comprise an upwardly extending portion and a slanted surface wherein the slated surface extends forwardly towards a front facing portion of the bridging clip 14. Thus, the teeth 15 of the bridging clip 14 slide along the surface of the teeth 13 of the embed 12. Once in position, the teeth 15 of the bridging clip 14 engage the teeth 13 of the embed 12 and the bridging clip 14 cannot be removed merely by pulling on bridging clip 14. To remove the bridging clip 14, the bridging clip must be lifted or otherwise positioned to disengage the teeth 15 of the bridging clip 14 from the teeth 13 of the embed 12.

FIGS. 28-31 illustrate an alternative embodiment of an attachment system 10. As shown, the attachment system 10 comprises an embed 12 and a bridging clip 14. The embed 12 is positioned in a recess in an outward facing surface of a base. FIG. 29 illustrates a rear view of the attachment system 10, showing the embed 12 as positioned in a base.

The bridging clip 14 is inserted into the embed 12 to a desired in/out position. Teeth are provided along at least one of an upper and lower inner surface of the embed 12. Corresponding teeth are provided along at least one of an upper and lower surface of the bridging clip 14. Once the bridging clip 14 is in the desired in/out position, the teeth on the bridging clip 14 are engaged with the teeth of the embed 12. Thus, teeth provided along an upper surface of the bridging clip 14 engage teeth provided along an upper inner surface of the embed 12. Similarly, teeth provided along a lower surface of the bridging clip 14 engage teeth provided along a lower surface of the embed 12. The teeth of the embed 12 and the teeth of the bridging clip 14 may be configured in any engaging configuration so long as the teeth engage with the teeth. In alternative embodiments, other configurations of engagement structures may be provided on the embed 12 and the bridging clip 14.

The position of the bridging clip 14 in the embed 12 may be adjusted laterally. When the desired position is achieved, a locking strip may be inserted between the bridging clip 14 and the embed 12 to fix the bridging clip 14 in place. In alternative embodiments, a locking strip may not be used.

End closure arms 20 (or anchor plates) may provided with the adjustable attachment system. The end closure arms 20 operate to seal the interior of the embed 12 from leakage of material along the sides 24 of the embed 12. The end closure arms 20 further provide increased gripping surface along the embed 12. The embed 12, end seals 22 and end closure arms 20 may be coupled to one another in any suitable manner. For example, fasteners such as screws 26 may be used. Alternately, the embed 12, end seals 22 and end closure arms 20 may be welded together.

The embed 12 has a front facing portion including lips 17 and 19. In the embodiments of FIGS. 28-31, the lips are relatively low profile. The extension of the lips 17 and 19 may vary. Further, the extension of the upper lip 17 may be different from the extension of the lower lip 19. The lips 17, 19 extend along the outward facing surface of the frame.

The embed 12 may include embed guides 50. The guides 50 serve as a tool to help gage uniform up/down placement of the embed. As shown, two guides 50 are included. In alternative embodiments, more or fewer guides 50 may be provided.

In the embodiment of FIGS. 29-31, slide fasteners 52 are provided on a top surface and a bottom surface of the embed 12. Reinforcement elements or rebars 54 may be provided at a location on the base where structural reinforcement is desired. Such reinforcement may be desirable, for example, in concrete forms. The embed 12 may be positioned on the base relative to the reinforcement elements 54. Slide fasteners 52 may be used to fasten the reinforcement elements 54 to the embed 12. As shown, a reinforcement element 52 is provided on an upper surface of the embed 12 and on a lower surface of the embed 12. In alternative embodiments, a single reinforcement element 54 may be used.

FIGS. 9-19 illustrate various embodiments of a bridging clip 15. As shown, the bridging clip 14 comprises an insertion portion 28 and an end portion 30. The insertion portion 28 comprises a planar portion 32 and an angled portion 34. In the embodiments shown, the angled portion 34 angles upwardly. A lower surface of the planar portion 32 and an upper surface of the angled portion 34 include teeth 15. Alternately, the bridging clip 14 may be configured with an angled portion extending downwardly, teeth 15 being provided on a lower surface of the angled portion 32 and an upper portion of the planar portion 28. Further, only one of the planar portion 30 and the angled portion 32 may be provided with teeth.

Each of FIGS. 9-15 illustrate alternate embodiments of end portions 30 of a bridging clip 14. The configuration of the end portion 30 and/or the provision of an attachment piece may be used to afford further adjustability to the adjustable attachment system. FIGS. 13-15 illustrate bridging clips 14 having end portions 30 comprising a hook portion 31 and an extending portion 33. In FIGS. 13-15, the hook portions 31 are substantially the same with the end portion 30 being varied for engagement with attachment pieces 35.

FIGS. 16-19 illustrate attachment pieces 35 engaged with the end portions 30 of the bridging clips 14. After positioning of the adjustable attachment system 10 in the frame, an attachment piece 35 may be provided to engage the end portion 30 of the bridging clip 14. Thus, the configuration of the end portion 30 determines the placement of the unit from the adjustable attachment system 10. Thus, for example, the unit may be placed at a slightly varying distance from the adjustable attachment system 10. Further, the unit may be hung such that the upper limit of the attachment piece 35 is at the same plane as the adjustable attachment system 10 (see, for example, FIGS. 17 and 19), is above the plane of the adjustable attachment system (see, for example, FIG. 18), or is below the plane of the adjustable attachment system (see, for example, FIG. 16).

Referring back to FIG. 6, a bridging clip 14 is shown having only a planar portion 32.

Each of FIGS. 4, 5, and 6 illustrate alternate embodiments of a locking strip 16. Any suitable configuration of locking strip 16 may be used so long as it operates to fix the bridging clip 14 into the embed 12 in the desired position. Permanent fixtures may be used to permanently fix the locking strip 16 in place. FIGS. 19 and 20 illustrate the locking strip 16 being inserted between the embed 12 and the bridging clip 14 and the locking strip 16 being fixed in place using fasteners 38.

FIGS. 22, 23, and 24 show assembled adjustable attachment system with a curtainwall unit 36 hanging therefrom. Each of FIGS. 22, 23, and 24 show a bridging clip 14 at a different position. FIG. 22 illustrates an in/out position of the bridging clip 14 within the embed 12 wherein the attachment piece 35 and attached curtainwall unit 36 hang some distance from the outward facing surface of the frame. FIG. 23 illustrates an in/out position of the bridging clip 14 within the embed 12 wherein the attachment piece 35 and attached curtainwall unit 36 hang a distance from the outward facing surface of the frame less than the distance of FIG. 22. FIG. 23 illustrates an in/out position of the bridging clip 14 within the embed 12 wherein the bridging clip 14 is at its maximum depth within the embed 12 and, thus, the attachment piece 35 and attached curtainwall unit 36 hang a minimal distance from the outward facing surface of the frame.

FIGS. 25 and 26 illustrate adjustable attachment systems 10 positioned in a frame 37 with an attachment piece 35 and attached curtainwall unit 36 hanging therefrom. In the embodiment of FIG. 25, the bridging clip 14 comprises an insertion portion having a planar portion 32 and an angled portion 34. In the embodiment of FIG. 26, the bridging clip 14 comprises an insertion portion having only a planar portion 32.

The embed 12 may be manufactured of any suitable material. For example, the embed 12 may be manufactured of extruded or cast aluminum or cast or forged steel. Thus, the embed 12 may be manufactured using any suitable process including extrusion (as a hollow or a semi-hollow), casting, and forging. Further, the embed 12 may be manufactured of plastic or other materials. The surfaces of the embed 12 that are exposed to the frame may be pretreated to resist corrosion or galvanic reaction. Thus, the embed may be covered with an isolation material. For example, when the embed 12 is to be placed in a concrete frame, the surfaces of the embed 12 to be exposed to the concrete may be pretreated with bituminous paint, dielectric isolator tape, or other protecting coating. The bridging clip 14 may also be manufactured of any suitable material. For example, the bridging clip 14 may be manufactured of extruded or cast aluminum or cast or forged steel. The teeth 13 of the embed 12 and the teeth 15 of the bridging clip 14 are matched to engage and interlock, thereby allowing adjustments to be made to locate the bridging clip 14 both in and out and laterally from the plane of the frame, the face of the slap, the column or shear wall.

For attaching a curtainwall unit to a building frame, the adjustable embed 12 (with end closure arms 20 and end seals 22 if provided) may be placed in concrete forms prior to pouring of the concrete with a designated face to be placed against the formwork. After pouring, the inside of the embed 12 is accessed by removing the peel strip 18 (or other sealing means) at the designated outboard positioned face after the formwork has been removed. The bridging clip 14 may then be inserted and positioned within the embed 12. After positioning, the locking strip 16 is inserted into the known dimensioned space above the bridging clip 14. In some embodiments, an end portion 30 may be coupled to the bridging clip 14 to customize the position of the curtainwall with respect to the adjustable attachment system 10.

FIG. 27 illustrates an adjustable attachment system used for attaching a pipe 42 to a base 44. The adjustable attachment system 10 comprises an embed 12, a bridging clip (or anchor plate) 14, and a locking strip (or wedge block) 16. The embed 12 is positioned in a recess in an outward facing surface of base. The outward facing surface may be any surface of the base. Thus, for example, the outward facing surface may be a top surface, a bottom surface, or a side surface. The bridging clip 14 is inserted into the embed 12 to a desired in/out position. As with the embodiments described above, teeth are provided along at least one of an upper and lower inner surface of the embed. Corresponding teeth are provided along at least one of an upper and lower surface of the bridging clip. Once the bridging clip 14 is in the desired in/out position, the teeth on the bridging clip 14 are engaged with the teeth of the embed 12. The position of the bridging clip 14 in the embed 12 may be adjusted laterally. When the desired position is achieved, the locking strip 16 is inserted between the bridging clip 14 and the embed 16 to fix the bridging clip 14 in place. An attachment piece 40 is provided configured for attachment to a pipe 42. The attachment piece 40 is coupled to the bridging clip 14. In alternative configurations, other configurations of attachment piece 40 may be provided for attachment to other units.

FIGS. 32-38 illustrate an adjustable attachment system 60 according to another embodiment. The adjustable attachment system 60 of the present embodiment may include an embed 62. The embed 62 may be in the shape of a box having a front face 66, a rear face 68, and at least two side faces 70. The embed 62 may also have a top face 72 and a bottom face 73. The embed 62 may include lips 67 and may have an opening 69 on its front face 66 and may include an opening 63 on its top face 72. The opening 63 on the top face may be covered by a lid 64. A bridging clip 74 may also be included with slotted holes 76 for inward and outward adjustment. The opening 69 on the front face 66 of the embed 62 may be adapted to receive the bridging clip 74. The embed 62 may also include anchors 80 extending away from the embed 62 to restrain the embed 62 against movement when embedded in a base material. The anchors 80 may extend through an outer wall of the embed 62 into the interior volume of the embed 62. The anchors 80 may be adapted for insertion into the slotted holes 76 of the bridging clip 74 and may be further adapted to receive a nut 82 and washer 84 for securing the bridging clip 76.

The opening 63, best shown in FIGS. 37 and 38, on the top face of the embed may be sized to allow access to the inside of the embed 62. Depending on the nature and size of the embed, the opening 63 may be relatively large and may allow for hand tightening of elements within the box or the opening 63 may be relatively small allowing only for insertion of a slender tool. The opening 63 may reflect a large portion of the top face 72 of the embed 62 or even the entire top face, or the opening 63 may only be a small opening relative to the size of the top face 72 or may be any size in between.

Referring to FIG. 32, the lid 64 may be configured to cover the opening 63. The lid 64 may extend beyond the outer perimeter of the opening 63 and further may be recessed into the top face 72 of the embed 62. In this recessed condition, the lid 64 may be flush with the outer surface of the top face 72. Further in this recessed condition, the lid 64 may be positioned to rest on a recessed shelf 71. The recessed shelf 71, best shown in FIGS. 37 and 38, may be defined on one edge by the outer perimeter of the opening 63 and on another edge by a perimeter lip 75. The lid 64 may be sized to fit within the perimeter lip 75. Alternatively, the lid 64 may be placed against the outer surface of the top face 72 and not recessed.

The lid 64 may be removably, pivotably, slidably, or hingedly attached to the embed 62 making the embed accessible from the top face 72. The lid 64 of the embed 62 may be removably fastened in a closed position with four screws 65 as show in FIG. 32. Alternatively, the lid 64 may be fastened with three or two or any number of fasteners. The fasteners may be any fastener known in the art including screws, bolts, clips, rivets, or the like. Alternatively or additionally, the lid 64 may be welded closed. In one embodiment, the lid 64 may be pivotably secured to the embed 62 with a single fastener. The fastener may be a limited release fastener having limited movement such that, when loosened, the fastener may be withdrawn from the embed 62 to a stopping point allowing the lid 64 to be lifted and rotated about the axis of the fastener, but not completely removed from the embed 62. In yet another embodiment, the lid 64 may slide into position along a track provided on two sides of the embed 62. The lid 64 may also have edges configured to engage the track and the embed 62 and the lid 64 may have an interlocking clip type engagement when the lid 64 is fully slid along the embed track. In still another embodiment, the lid 64 may have a hinge along any of its four sides allowing the lid 64 to be opened without separating it from the embed 62. In this embodiment, the free end opposite the hinge may be fastened with any of the above mentioned fastening devices or any known latching device.

Together with the several attachment options discussed above, the lid 64 may include a sealing element. This sealing element may include a gasket placed on or permanently positioned between the lid 64 and the embed 62. The seal may also include a strip seal positioned on the perimeter of the lid 64 or in the seam between the lid 64 and the embed 62. In addition or alternatively, the lid 64 may be taped and the seam between the embed 62 and the lid 64 may be partially or completely covered. In the case of a welded lid 64, the full perimeter may be partially welded or alternatively may be seal welded.

The surface of the lid 64 may also be adapted for several exposure conditions. For example, where the embed 62 is used in a floor slab of a building and is placed flush with the top surface of a floor slab, the lid 64 may be adapted to accommodate several building conditions. The lid 64 may include a recessed channel for wiring or conduit to pass through the embed 62. The lid 64 may include a recessed channel for receiving the bottom edge of sheetrock panels. The lid may also be adapted to receive carpet tack strips.

FIGS. 33 and 34 show an additional view of the embed 62 wherein the bridging clip 74 is in a retracted position. In FIG. 34, similar to that shown in FIG. 7, a peel strip 78 may be included to close the opening off to the entrance of debris. The peel strip 78 may be a piece of adhesive backed material placed across the opening 69, or it may include an insert that is forcibly fit into the opening 69. In the case of an insert, a portion of the peel strip 78 may overlap the surface of the embed lips 67 to aid the installer in removing the peel strip 78. In FIG. 33, a peel strip 78 is not shown.

FIGS. 33 and 34 also show horizontally extending lips 67 on the front face 66 of the embed 62. These lips 67 may function to assist in fastening the embed 62 to formwork or other surfaces prior to placement of a base material. As best shown in FIG. 33, holes 86 may be provided in the lips 67 for receiving screws to fasten the embed 62. Holes 86 may also be provided in alternative faces of the embed 62 for attaching to form work or other support surfaces. In another embodiment, the embed 62 may include a clip configured to slip over the top edge of a piece of formwork so as to position the top of the embed 62 flush with the top of the formwork. In yet another embodiment, the embed 62 may include clips or loops for attaching to reinforcing in a base material prior to placing the base material. In still another embodiment, the embed 62 may have extended metal tabs for fastening to form work or reinforcing.

FIGS. 35 and 36 show the embed 62 in an upright position and an upside down position respectively. As shown in both figures, the embed 62 may include anchors 80. The anchors 80 may function to engage the embed 62 with a base. For example, where the embed 62 is placed in a concrete slab and thus, concrete is poured around the embed 62 and allowed to cure, the anchors 80 may extend away from the embed 62 into the concrete slab thereby securing the embed 62 in the slab. The anchors 80 may be any material, including, but not limited to reinforcing bar, threaded rods, plate material, bent plate material, or any material adapted to engage a base material. The anchors 80 may be affixed to the embed 62 as shown or may be otherwise separate from the embed 62.

Where the anchors 80 are separate from the embed 62, the anchors 80 may be placed to cause the embed 80 to engage the base. That is, the anchors 80 may be positioned adjacent to or hooked around a given portion of the embed 62 and may extend into the base. As such, the lap length of the anchor 80 with the embed 62 or the hook of the anchor 80 around a portion of the embed 62 may activate the engagement properties of the base and cause the embed 62 to be anchored in the base. For example, in a concrete base, the frictional characteristics of the concrete including the aggregate interlock may provide for transfer of force from the embed 62 to the anchor 80 through an appropriate lap length with the embed 80 or hook around the embed 80. The frictional characteristics of the concrete may then allow for appropriate distribution of force from the anchor 80 to a slab, for example, as the anchor 80 extends away from the embed 62.

In some embodiments, the anchors 80 may be affixed to the embed 62. Referring to FIG. 36, two bottom anchors 80 are shown extending out the bottom of the embed 62 and two back anchors 80 are shown extending angularly downward out of the back of the embed 62. The anchors 80 may extend from any side of the embed 62 at any angle relative to the surface of the embed 62. In one embodiment, the anchors may extend from the bottom face and/or rear face and/or at least one side face of the embed, but may be omitted from at least one side face and the top face. As such, the embed may be situated flush with an upper surface of a base and an edge of a base while still being anchored in the base.

Where the anchors 80 are affixed to the embed, the anchors 80 may be rigidly attached to the embed 62 or may be free to rotate or pivot relative to the surface of the embed 62. The anchors 80 may also be adjustable in a direction parallel to their longitudinal axis. In one embodiment, the anchors 80 may extend through the wall of the embed 62 into the internal volume of the embed 62. The portion of the anchor 80 within the embed 62 may then be used to secure a bridging clip 74. The anchors 80 shown in FIGS. 35 and 36 are generally straight. However, the anchors 80 may be formed in any shape. For example, they may be straight as they exit the embed 62, but then be bent to extend at an angle. The anchors 80 may terminate inside the embed 62 with a bolt head, a nut, a welded connection, a cotter pin connection, or any other securing mechanism.

In the case of anchors 80 separate from the embed 62 and thus not extending through the wall of the embed 62 as shown, a connection mechanism may be provided on the inside of the embed for securing the bridging clip. The connection mechanism may be a threaded rod welded to the inside of the embed 62, a bolt anchored through the embed, or a clamp or any other mechanism disclosed herein or known in the art for attaching a relatively flat piece of material such as a bridging clip.

The anchors 80, in addition to engaging with a base material, may be used to adjust the height of the embed 62 within a base or concrete floor slab prior to pouring of the concrete. In this embodiment, the anchors 80 may be threaded rods and adjusting nuts may be provided along the length of the anchor 80. These adjusting nuts may include a single nut inside the embed 62 and/or a single nut on the outside of the embed 62. Twisting the nuts and/or the anchor 80 may allow the anchor 80 to be adjusted inward and outward through the wall of the embed 62. Alternatively, the embed 62 may included a threaded sleeve through which the anchor 80 penetrates the wall of the embed 62. The anchor 80 may then be adjusted inward or outward by turning the anchor 80. Where the anchor 80 rests on the bottom surface of formwork or on any supporting surface, the inward and outward movement of the anchor 80 may allow for vertical adjustment of the embed 62. Those skilled in the art will understand and appreciate that various adjustments of the anchors 80 shown could be used to level and tilt the embed 62 by adjusting the anchors 80 inward and outward.

Referring still to FIGS. 35 and 36, two reinforcing ribs 88 are shown. The ribs 88 generally may extend from the front of the embed 62 to the back of the embed 62 along a line connecting a bottom anchor 80 to a corresponding back anchor 80. The ribs 88 may taper from relatively thin near the front of the embed 62 to relatively thick near the back of the embed 62.

In other embodiments, the ribs 88 may form protrusions extending away from the embed 62 for engagement with anchors 80, the anchors 80 being in the form of lapped or hooked bars. In other embodiments, the ribs 88 may be a series of crossing ribs on the lower surface of the embed 62 for causing an interlocking engagement with a base material. In other embodiments, the ribs 88 may be relatively tall in a direction perpendicular to the surface of the embed 62 and relatively narrow in a direction parallel to the surface of the embed 62. As such, the ribs 88 may have a tab-like or ear-like shape. In some embodiments, these tab-like ribs 88 may have a relatively short or relatively long length and may include one or more openings passing laterally through them for receiving or passing through of anchors 80. The openings may or may not align with additional openings in other ribs 88. The anchors 80 may be inserted through one or several openings and may, in turn, extend into the base material. The anchors 80 may extend relatively straight through the openings or may be bent, hooked, or otherwise formed to engage the ribs 88 and the base material. In other embodiments, the ribs 88 may include a coupling that is directly attachable to an anchor 80.

In some embodiments, the ribs 88 may act to transfer force directly from the securing point of the bridging clip to the anchors 80 or the base material. In other embodiments, the ribs 88 may act to transfer force from the embed 62 to the anchors 80 or the base material. In certain examples, the ribs 88 may be integral with the embed 62 or may be added on via clips, snap connections, fasteners, or other methods known in the art. For example, in the case of a plastic embed 62, the ribs 88 may be a stronger metal material and may be screwed to the embed 62.

FIGS. 37 and 38 each illustrate an adjustable attachment system 60 according to certain embodiments. In FIGS. 37 and 38 a lid 64 is not shown. As shown, a bridging clip 74 may be inserted through the front opening 69 of the embed 62. FIG. 37 shows the bridging clip 74 extending slightly outward from the embed 62 and FIG. 35 shows the bridging clip 74 in a retracted position.

As can be seen from FIGS. 37 and 38, the bridging clip 74 may include a generally planar insertion portion 92 and an end portion 94. The end portion 94 may be any shape necessary for attachment of a curtain wall system including those discussed with respect to FIGS. 9-19. In the present embodiment, the insertion portion 92 may include at least two horizontal straight slots 76 configured for inward and outward adjustment of the bridging clip 74. The slots 76 may be spaced apart a distance approximately equal to the spacing of the anchors 80. Where the anchors 80 extend into the internal volume of the embed 62, the anchors 80 may engage the slotted holes 76 and provide for slidable adjustment of the bridging clip 74.

The slots 76 may be a standard slot width for receiving a threaded rod or other anchor 80, but may also be oversized in width to provide lateral adjustment of the bridging clip 74 in addition to inward and outward adjustment. Those skilled in the art will understand and appreciate that the oversized slots 76 may also allow for the bridging clip 74 to be rotated slightly. Alternatively, the slots 76 may be in the shape of opposing arcs to allow for rotational adjustment of the bridging clip 74. The rotational adjustment may be in the range of 0 to 5 degrees.

The bridging clips 74 shown in FIGS. 37 and 38 also include teeth 96 on an upper surface. Plate washers 84 are shown with teeth 96 on a lower surface. The teeth 96 of the washers 84 and the bridging clip 74 are adapted to interlock and engage one another. Also shown are nuts 82 threaded onto the top end of the anchors 80 for fastening the washers 84 against the surface of the bridging clip 74. The bridging clip 74 may also or alternatively include teeth 96 on a bottom surface and corresponding teeth could be provided on the bottom internal surface of the embed 62.

Vertical adjustment of the bridging clip 74 may be provided by additional shimming washers placed below the bridging clip 74 and above the bottom surface of the embed 62. These shimming washers may be flat plate washers or alternatively may include upward facing teeth 96 for engaging teeth 96 provided on the bottom surface of the bridging clip 74. Alternatively, where teeth 96 have been provided on the bottom internal surface of the embed 62 and teeth 96 have been provided on the bottom of the bridging clip 74, the washers may include teeth 96 on both the top and bottom surface for engaging both the bridging clip 74 and the embed 62. The shimming washers may be any shape or size. Preferably, the shimming washers may be similar in size to the bridging clip 74 and include slots for receiving the upward extending anchors 80.

In use, the slots 76 in the bridging clip 74 may allow it to slide freely along the anchors 80, when the nut 82 and washer 84 are not tightened or are not in place. Once the bridging clip 74 is positioned, the washers 84 may be placed on top of the bridging clip 74 allowing the teeth 96 of the washer 84 to engage the teeth 96 of the bridging clip 74. A nut 82 may then be placed on the anchor 80 over the washer 84 to fasten the assembly together. Inward and outward movement of the bridging clip 74 is resisted by the teeth 96 of the washer 84. The washer 84 is prevented from moving due to its bearing condition against the surface of the anchor 80. As mentioned above, the anchors 80 extending into the base prevent movement of the embed 62 and the bridging clip 74. Where shimming washers are used to adjust the bridging clip 74 upward, these washers may be placed prior to placement of the bridging clip 74.

Another embodiment of an adjustable attachment system 160 is shown in FIGS. 39-42. In this embodiment, as shown in FIG. 39, the system 160 may include an embed 162. The embed 162 may be in the shape of a box defining a front face 166, a rear face 168, and at least two side faces 170. The embed 162 may also have a top face 172 and a bottom face 173. The embed 162 may include lips 167 and may be substantially open on the top face 172 and a the front face 166. The embed 162 may also include a lid 164 for covering the top face and a portion of the front face. A bridging clip 174 may also be included with slotted holes 176 for inward and outward adjustment. The embed 162 may also include anchors 180 extending away from the embed 162 to restrain the embed 162 against movement when embedded in a base material.

The lid 164 may be generally flat and may contain flanges comprising bent edges. The flanges may correspond to the front face 166, rear face 168, and side faces 170 of the embed 162 and as such may be referred to herein as a front flange 167, rear flange 169 (not shown), and/or side flange 171. The lid 164 may be sized so that each of the flanges 167, 169, 171 may be positioned just to the inside edge of its respective embed face. Any combination of flanges 167, 169, 171 may be included. For example, where the lid 164 is hinged to the rear face 168 of the embed 162, the rear flange 169 may be omitted. The flanges 167, 169, 171 may extend the full depth of the box so as to position the lid 164 flush with the top face 172 of the embed 162. However, the front flange 167 of the lid 164 may be adapted to accommodate the bridging clip 174. That is, the front flange 167 may extend along the front face 166 of the embed 162 a distance approximately equal to the depth of the embed 162 less the thickness of the bridging clip 174. In other embodiments, the front flange 167 may extend a shorter distance along the front face 166 to allow for some adjustment of the bridging clip 174 within the depth of the embed 162 without interfering with the tip of the front flange 167.

As shown in FIG. 40, the embed 162 may be positioned in a base flush with an upper surface and an outer surface of the base and the lid 164 may nest inside the embed 162.

A top view of the embed 162 is shown in FIG. 41 and depicts the inside of the embed as accessible from the top and the front due to the open top and front faces 172, 166.

As shown in FIG. 42, a side view of an embed 162 is shown with an anchor 180 extending vertically down from the bottom face 173 of the embed 162. Also shown is a horizontally extending rib 188, which further extends as an additional anchor 180 beyond the rear face 168 of the embed 162 in the form of a bent plate. Additional features of the embed 162 may include any or all of those features described with respect to embed 62.

The several embodiments of an embed described may be made of any material including, but not limited to, metal, plastic, or composite materials. The exterior and/or interior of the box may be milled, anodized, painted, or otherwise coated and/or protected. The coating may be any coating, including, but not limited to latex paint, bituminous based paint, epoxy based paint, galvanization, or any other coating known in the art.

The embed may also be any shape and is not limited to a rectangular box as shown in the figures. For example, the embed may be skewed in plan view to form a parallelogram shape to allow specific curtain wall support points to be provided along the edge of a base material and still avoid base material interruptions, such as pipe penetrations, electrical conduit penetrations, floor recesses and the like. The embed may taper as it extends into the base material or alternatively may expand as it extends into the base material. Those skilled in the art will understand and appreciate that several shapes may be provided.

The interior volume of the embed may be stuffed or otherwise filled with a material to increase its insulation, sound transmission, or fire resistive properties. The fill may be included for other reasons as well, such as to protect against damage to the lid. This may appropriate in cases where the lid is thin or is otherwise prone to damage due to weight or force on the surface of the lid. As such, the fill material may be compressible or non-compressible and may be more permanent or less permanent depending on the need to access the internal space of the embed over time. The fill material may be a form of batt, polystyrene, spray-in, or other insulation. Additionally, the fill may be an epoxy, a granular material, a concrete material, or any other material adaptable for placement within the embed.

The embodiments shown and described with respect to FIGS. 32-42 are advantageous because the embed can be placed flush with outer and upper surfaces of a base material. This may eliminate the need for base material above the embed. Thus, the overall thickness of the base material can be decreased relative to alternative embeds that require base cover on the top and bottom of the embed. In concrete applications, this allows the presently described embed to be used in concrete floors formed with metal form decking or composite decking. In this condition, the uniform concrete thickness above the flutes of the decking may be minimized relative to that of a concrete floor formed on a flat supporting surface. By allowing the embed to be placed flush with the top of the slab, the embed may be provided with sufficient clearance from the flutes of the metal deck without requiring a thicker slab.

The presently described embodiment is also advantageous because of the direct load path from the bridging clip to the anchors. This direct load path minimizes the forces the embed needs to resist, which in turn minimizes the material strength and thickness needed for the embed and may minimize the cost.

The presently described embodiment is also advantageous because of the internal access it provides to the embed. This internal access allows the embed to be cleared of any debris. It also provides easier access to the bridging clip attachment allowing the bridging clip to be more precisely positioned.

The adjustable attachment system may be used for attaching any suitable unit to any suitable base. For example, the base may be a wood, drywall, brick, concrete, steel, or other. The base may comprise a frame structure, a wall, a ceiling, a floor, or any other structural component. The embed of the attachment system may be provided in the base in any suitable manner. For example, the embed may be placed in concrete, the embed may be built into a brick wall, the embed may be anchored into a drywall sheet, or the embed may be fastened to a wood piece. Alternatively, the embed may be screwed, welded or otherwise fastened to metal structure. Regarding any suitable unit, the adjustable attachment system may be used to attach plumbing, electrical conduit, ceilings, mechanical material and equipment, technology material equipment or other elements requiring attachment.

The length of the embed and the bridging clip may be varied to vary the load capacity of the adjustable attachment system. More specifically, the longer the embed and the bridging clip, the higher the load capacity of the adjustable attachment system. Further, in order to increase the load capacity of the adjustable attachment system rebar may be slid through the embed.

Although the present invention has been described with reference to preferred embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. 

1. An embed for embedding in a base, the embed comprising a box defining a top face and at least one side face, the top face configured to be placed flush with an upper surface of the base, and the at least one side face configured to be placed flush with an edge of the base.
 2. The embed of claim 1, wherein the top face comprises a substantially open top face configured to provide access to the inside of the embed.
 3. The embed of claim 2, further comprising a lid configured to cover the open top face.
 4. The embed of claim 1, wherein the top face includes a recessed shelf and a perimeter lip and the lid is recessed into the top face.
 5. The embed of claim 4, wherein the lid is removably attached to the embed.
 6. The embed of claim 4, wherein the lid is pivotably attached to the embed.
 7. The embed of claim 3, wherein the side face comprises a substantially open side face.
 8. The embed of claim 7, wherein the open side face is configured to receive a bridging clip.
 9. The embed of claim 8, further comprising at least one anchor extending from the embed.
 10. The embed of claim 9, wherein the at least one anchor is a threaded rod anchor.
 11. The embed of claim 10, wherein the embed is adapted for threaded engagement with the at least one anchor, the at least one anchor adjustably extending into the internal volume of the embed.
 12. An adjustable attachment system comprising: an embed for positioning in a base; and a bridging clip configured for insertion in the embed and adapted for coupling to a unit.
 13. The adjustable attachment system of claim 12, wherein the embed is in the shape of a box.
 14. The adjustable attachment system of claim 13, wherein the base has an upper surface and an outer surface and the embed is adapted to be positioned flush with the upper and outer surfaces.
 15. The adjustable attachment system of claim 14, further comprising at least one anchor extending from the embed.
 16. The adjustable attachment system of claim 15, wherein the embed includes a removably attachable lid.
 17. The adjustable attachment system of claim 16, wherein the at least one anchor extends in a direction away from the outer and upper surface of the base.
 18. The adjustable attachment system of claim 17, wherein the bridging clip includes slotted holes.
 19. The adjustable attachment system of claim 18, wherein the at least one anchor is a threaded rod anchor.
 20. The adjustable attachment system of claim 19, wherein the embed is adapted for threaded engagement with the at least one anchor, the at least one anchor adjustably extending into the internal volume of the embed.
 21. The adjustable attachment system of claim 20, wherein the bridging clip further comprises teeth on an upper surface.
 22. The adjustable attachment system of claim 21, further comprising at least one washer with teeth on a bottom surface adapted to engage the teeth of the bridging clip.
 23. The adjustable attachment system of claim 22, further comprising a peel strip.
 24. The adjustable attachment system of claim 22, further comprising a lid.
 25. The adjustable attachment system of claim 24, further comprising at least one fastener for removably attaching the lid to the embed.
 26. An adjustable attachment system kit comprising: an embed box with a removably attachable lid; a bridging clip; at least one nut; and at least one washer.
 27. The kit of claim 26, wherein the embed box includes at least one threaded rod anchor extending into the internal volume of the embed.
 28. The kit of claim 27, wherein the embed is adapted for threaded engagement with the at least one threaded rod anchor.
 29. The kit of claim 28, wherein the bridging clip includes slotted holes for receiving the at least one threaded rod anchor.
 30. The kit of claim 29, wherein the bridging clip includes teeth on an upper surface and the at least one washer includes teeth on a lower surface adapted to engage the teeth of the bridging clip.
 31. The kit of claim 30, wherein the at least one nut is adapted for threaded engagement with the anchor. 